From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, samitolvanen@google.com, alxmtvv@gmail.com,
linux-kbuild@vger.kernel.org, yamada.masahiro@socionext.com,
akpm@linux-foundation.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 09/21] lto: Use C version for SYSCALL_ALIAS
Date: Mon, 27 Nov 2017 13:34:11 -0800 [thread overview]
Message-ID: <20171127213423.27218-10-andi@firstfloor.org> (raw)
In-Reply-To: <20171127213423.27218-1-andi@firstfloor.org>
From: Andi Kleen <ak@linux.intel.com>
LTO doesn't like the assembler aliasing used for SYSCALL_ALIAS.
Replace it with C aliasing. Also mark the only user visible.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
include/linux/linkage.h | 6 ++----
kernel/time/posix-stubs.c | 2 +-
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index f68db9e450eb..24fb6468b1a5 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -30,10 +30,8 @@
#endif
#ifndef SYSCALL_ALIAS
-#define SYSCALL_ALIAS(alias, name) asm( \
- ".globl " VMLINUX_SYMBOL_STR(alias) "\n\t" \
- ".set " VMLINUX_SYMBOL_STR(alias) "," \
- VMLINUX_SYMBOL_STR(name))
+#define SYSCALL_ALIAS(a, name) \
+ __visible typeof(a) a __attribute__((alias(__stringify(name))))
#endif
#define __page_aligned_data __section(.data..page_aligned) __aligned(PAGE_SIZE)
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index b258bee13b02..5e36cb75f3be 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -19,7 +19,7 @@
#include <linux/posix-timers.h>
#include <linux/compat.h>
-asmlinkage long sys_ni_posix_timers(void)
+__visible asmlinkage long sys_ni_posix_timers(void)
{
pr_err_once("process %d (%s) attempted a POSIX timer syscall "
"while CONFIG_POSIX_TIMERS is not set\n",
--
2.13.6
next prev parent reply other threads:[~2017-11-27 21:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-27 21:34 Link time optimization for LTO/x86 Andi Kleen
2017-11-27 21:34 ` [PATCH 01/21] x86/xen: Mark pv stub assembler symbol visible Andi Kleen
2017-11-27 21:34 ` [PATCH 02/21] afs: Fix const confusion in AFS Andi Kleen
2017-11-27 21:34 ` [PATCH 03/21] x86/timer: Don't inline __const_udelay Andi Kleen
2017-11-27 21:34 ` [PATCH 04/21] locking/spinlocks: Mark spinlocks noinline when inline spinlocks are disabled Andi Kleen
2017-11-27 21:34 ` [PATCH 05/21] x86/kvm: Make steal_time visible Andi Kleen
2017-11-27 21:34 ` [PATCH 06/21] x86/syscalls: Make x86 syscalls use real prototypes Andi Kleen
2017-11-27 21:34 ` [PATCH 07/21] x86: Make exception handler functions visible Andi Kleen
2017-11-27 21:34 ` [PATCH 08/21] x86/idt: Make const __initconst Andi Kleen
2017-11-27 21:34 ` Andi Kleen [this message]
2017-11-27 21:34 ` [PATCH 10/21] Fix read buffer overflow in delta-ipc Andi Kleen
2017-11-27 21:34 ` [PATCH 11/21] trace: Use -mcount-record for dynamic ftrace Andi Kleen
2017-12-01 0:22 ` Steven Rostedt
2018-05-01 18:42 ` Steven Rostedt
2017-11-27 21:34 ` [PATCH 12/21] ftrace: Mark function tracer test functions noinline/noclone Andi Kleen
2017-11-27 21:34 ` [PATCH 13/21] ftrace: Disable LTO for ftrace self tests Andi Kleen
2017-11-27 21:34 ` [PATCH 14/21] lto, fs: Avoid static variable in linux/fs.h Andi Kleen
2017-11-27 21:34 ` [PATCH 15/21] lto, x86, mm: Disable vmalloc BUILD_BUG_ON for LTO Andi Kleen
2017-11-27 21:34 ` [PATCH 16/21] lto: Add __noreorder and mark initcalls __noreorder Andi Kleen
2017-11-27 21:34 ` [PATCH 17/21] lto, workaround: Disable LTO for BPF Andi Kleen
2017-11-27 21:34 ` [PATCH 18/21] lto, crypto: Disable LTO for camelia glue Andi Kleen
2017-11-27 21:34 ` [PATCH 19/21] lto, x86: Disable LTO for realmode / vDSO / head64 Andi Kleen
2017-11-27 21:34 ` [PATCH 20/21] Kbuild, lto: Add Link Time Optimization support Andi Kleen
2018-01-27 0:15 ` Arnd Bergmann
2018-01-27 0:55 ` Andi Kleen
2018-01-27 14:26 ` Arnd Bergmann
2018-01-28 18:33 ` Andi Kleen
2017-11-27 21:34 ` [PATCH 21/21] x86: Enable Link Time Optimization Andi Kleen
2017-11-28 16:04 ` [PATCH 02/21] afs: Fix const confusion in AFS David Howells
2017-11-28 16:50 ` Andi Kleen
2017-11-29 23:09 ` Link time optimization for LTO/x86 Sami Tolvanen
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